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Yamaha XV750 Virago Manual

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Chapter 1 Tune-up and routine maintenance
16.2 On XV535 models, remove the Allen
bolts and lift off the cylinder head
side covers
16.3b ... check the rubber seals for
brittleness and the plastic for cracks
16.3c The spark plugs are inside wells in
the cylinder heads, so you'll need a
socket with a rubber insert to grip
the plug
16.7a Spark plug manufacturers
recommend using a wire type gauge when
checking the gap - if the wire doesn't slide
between the electrodes with a slight drag,
adjustment is required
16.7b To change the gap, bend the side
electrode only, as indicated by the
arrows, and be very careful not to crack
or chip the ceramic insulator surrounding
the center electrode
to each cylinder by inserting the nozzle of a squirt-type oil can through
the spark plug holes. The oil will tend to seal the piston rings if they are
leaking. Repeat the test for the other cylinder.
12 If the compression increases significantly after the addition of the
oil, the piston rings and/or cylinders are definitely worn. If the
compression does not increase, the pressure is leaking past the valves
or the head gasket. Leakage past the valves may be due to insufficient
valve clearances, burned, warped or cracked valves or valve seats or
valves that are hanging up in the guides.
13 If compression readings are considerably higher than specified,
the combustion chambers are probably coated with excessive carbon
deposits. It is possible (but not very likely) for carbon deposits to raise
the compression enough to compensate for the effects of leakage past
rings or valves. Remove the cylinder head and carefully decarbonize
the combustion chambers (see Chapter 2).
16 Spark plugs - replacement
Refer to illustrations 16.2, 16.3a, 16.3b, 16.3c, 16.7aand 16.7b
1 Make sure your spark plug socket is the correct size before
attempting to remove the plugs.
2 If you're working on an XV535 model, remove the cylinder head
side covers (see illustration).
3 Disconnect the spark plug caps from the spark plugs (see
illustrations). If available, use compressed air to. blow any
accumulated debris from around the spark plugs. Remove the plugs
(see illustration).
4 Inspect the electrodes for wear. Both the center and side
electrodes should have square edges and the side electrode should be
of uniform thickness. Look for excessive deposits and evidence of a
cracked or chipped insulator around the center electrode. Compare
your spark plugs to the color spark plug reading chart. Check the
threads, the washer and the ceramic insulator body for cracks and
other damage.
5 If the electrodes are not excessively worn, and if the deposits can
be easily removed with a wire brush, the plugs can be regapped and
reused (if no cracks or chips are visible in the insulator). If in doubt
concerning the condition of the plugs, replace them with new ones, as
the expense is minimal.
6 Cleaning spark plugs by sandblasting is permitted, provided you
clean the plugs with a high flash-point solvent afterwards.
7 Before installing new plugs, make sure they are the correct type
and heat range. Check the gap between the electrodes, as they are not
preset. For best results, use a wire-type gauge rather than a flat gauge
to cheGk the gap (see illustration). If the gap must be adjusted, bend
the side electrode only and be very careful not to chip or crack the
insulator nose (see illustration). Make sure the washer is in place
before installing each plug.
16.3a Twist and pull the spark plug caps
to detach them from the plugs ...
… 45 …


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  • Hi am Gavin from Napier, New Zealand- Does anyone know the correct clearance between the clutch basket bush and the gearbox input shaft on my 1990 Yamaha Virago xv 750 please? Submitted on 12-12-2021 at 00:03

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